Add a sanity check for running etcd servers to the integration test script.
Use http.StatusInternalServerError instead of 500
Fix typo in README
Merge pull request #652 from kelseyhightower/fix_readme_typo

Fix typo in README
Merge pull request #650 from smarterclayton/use_constant_code

Use http.StatusInternalServerError instead of 500
Merge pull request #645 from brendandburns/integration

Add a sanity check for existing etcd servers to the integration test script
Use 'go install' to build all commands at the same time.

'go build' compiles the packages but discards the results if multiple packages specified.